code: def parse_args():
      """
      Helper function parsing the command line options
      """
      parser = ArgumentParser(
          description="PyTorch distributed training launch "
          "helper utilty that will spawn up "
          "parties for MPC scripts on AWS"
      )
  
      parser.add_argument(
          "--credentials",
          type=str,
          default=f"{Path.home()}/.aws/credentials",
          help="Credentials used to access AWS",
      )
  
      parser.add_argument(
          "--only_show_instance_ips",
          action="store_true",
          default=False,
          help="Only show public IPs of the given instances."
          "No other actions will be done",
      )
  
      parser.add_argument(
          "--regions", type=str, default="us-west-2", help="AWS Region"
      )
  
      parser.add_argument(
          "--instances",
          type=str,
          required=True,
          help="The comma-separated ids of AWS instances",
      )
  
      parser.add_argument(
          "--master_port",
          type=int,
          default=29500,
          help="The port used by master instance "
          "for distributed training",
      )
  
      parser.add_argument(
          "--ssh_key_file",
          type=str,
          required=True,
          help="Path to the RSA private key file "
          "used for instance authentication",
      )
  
      parser.add_argument(
          "--ssh_user",
          type=str,
          default="ubuntu",
          help="The username to ssh to AWS instance",
      )
  
      parser.add_argument(
          "--http_proxy",
          type=str,
          default=None,
          help="If not none, use the http proxy specified "
          "(e.g., fwdproxy:8080) to ssh to AWS instance",
      )
  
      parser.add_argument(
          "--aux_files",
          type=str,
          default=None,
          help="The comma-separated paths of additional files "
          " that need to be transferred to AWS instances. "
          "If more than one file needs to be transferred, "
          "the basename of any two files can not be the "
          "same.",
      )
  
      parser.add_argument(
          "--prepare_cmd",
          type=str,
          default="",
          help="The command to run before running distribute "
          "training for prepare purpose, e.g., setup "
          "environment, extract data files, etc.",
      )
  
      # positional
      parser.add_argument(
          "training_script",
          type=str,
          help="The full path to the single machine training "
          "program/script to be launched in parallel, "
          "followed by all the arguments for the "
          "training script",
      )
  
      # rest from the training program
      parser.add_argument("training_script_args", nargs=REMAINDER)
      return parser.parse_args()
  
file_path: CrypTen/scripts/aws_launcher.py
imports: import concurrent.futures
  import configparser
  import os
  import sys
  import time
  import uuid
  import warnings
  from argparse import ArgumentParser, REMAINDER
  from pathlib import Path
  import boto3
  import paramiko
label_desc: Use image node_id 7 for calling a global function with example usage: parse_args() and returns: parser